حَدَّثَنَا هَارُونُ بْنُ مَعْرُوفٍ، وَمُحَمَّدُ بْنُ عَبَّادٍ، - وَاللَّفْظُ لِهَارُونَ - قَالاَ حَدَّثَنَا سُفْيَانُ، عَنْ هِشَامٍ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ يَزَالُ النَّاسُ يَتَسَاءَلُونَ حَتَّى يُقَالَ هَذَا خَلَقَ اللَّهُ الْخَلْقَ فَمَنْ خَلَقَ اللَّهَ فَمَنْ وَجَدَ مِنْ ذَلِكَ شَيْئًا فَلْيَقُلْ آمَنْتُ بِاللَّهِ " .
It is narrated on the authority of Abu Huraira that the Messenger of Allah (PBUH) said: Men will continue to question one another till this is propounded: Allah created all things but who created Allah? He who found himself confronted with such a situation should say: I affirm my faith in Allah. Translation Not Available
Book Ref: Sahih Muslim Book 1 Hadith 242
Web Ref: Sahih Muslim Book 1 Hadith 134 a